Warm air furnace and radiator construction



March 23, 1954 w JOROLEMON 2,672,858

} WARM AIR FURNACE AND RADIATOR CONSTRUCTION Filed March 9, 1950 2 Sheets-Sheet l Bnventor March 23, 1954 E, w. JOROLEMON WARM AIR FURNACE AND RADIATOR CONSTRUCTION 2 Sheets-Sheet 2 Filed March 9, 1950 Zhmentor 6522M C/ztaZazzzozz Gttorncgs bustion shell is provided with a, relatively largev opening to receive a burner mounting sleeve or frame 64, which is welded to the body 22 and extends outwardly to a similar opening in the casing 10. The outer edges of the burner mounting sleeve ar provided with flanges 66 to which a burner mounting plate 68 is secured, the mounting plate in turn having its outer edges fastened to the casing. A conventional fluid fuel burner of the vaporizing type with forced draft has been more or less diagrammatically shown in Figure v1. The blower and controls 12 for the burner are mounted on the outer side of plate 68 and its pct 14 is positioned within the lower end of the combustion shell l8, the air tube 16 being positioned within the interjacent mounting sleeve 64. It will be understood by those skilled in the art that other known types of fluid fuel burners than that shown herein may be used with the present furnace construction. As one example thereof, it might be mentioned that this furnace construction is adapted without modification for an oil burner of the pressure atomizing type with a conventional burner supported on the mounting plate 68 and having a firebox within the lower end of the combustion shell.

The body 22 of the combustion shell I8 is provided above the burner receiving opening with another, smaller opening to receive the inner end of a sleeve or frame 18, which is welded to the body 22 and extends outwardly through an open ing in the casing 10 and secured thereto. The frame 18 mounts an observation door 80, which is preferably hinged to the frame and adapted to be swung outwardly when it is desired to observe or inspect the operation of the burner.

A wrap around wipe sheet 82, having suitable openings for the outlet flue 60, burner mounting sleeve 64 and the frame 18, is provided between the heat transfer unit and the external jacket or casing ID. This wipe sheet '82 absorbs radiant heat from the combustion shell [8 and radiator 20, this heat being picked up by the air stream rising within the passage 84 between the wipe sheet and the combustion shell. The space 86 defined by the casing and the wipe sheet functions as an insulating layer to assure more efficient air circulation and minimize heat loss.

With the above described furnace construc- *tion it will be seen that when the burner is operated the burner flame and combustion gases :rise within the combustion shell [8, and the combustion gases then pass through duct 52 into the radiator chamber or passage 48 and flow horizontally in both directions around the conical-member 30 to the outlet flue 60. The radi- .ator 20 retards the flow of hot combustion gases, and all of the walls of the heat transfer unit are heated to provide a relatively large heating surface for transmitting heat to the air which rises or may be forced upwardly through the passage 84 between the combustion shell and the wipe he -w: 7

Since the radiator extends beyond the sideof the combustion shell 18 it will beseen that the rising airwill be diverted bythe outer, lower edge of the radiator so that the air will flow through the passage 62 between the conical radiator wall 30 and the top wall 26 of the combustion shell l0 and also through the passage 88 between the outer radiator member 28 and th upper portion of the wipe sheet 82. This division of the air stream further increases the heat transfer area and permits all the radiator surfaces to be most effectively used for heating the air.

It will be noted, moreover, that the present furnace is provided with a heat transfer unit of very simple construction which can be readily fabricated from flat metal sheets with continuous welded seams to eliminate any possibility of combustion gas leaks.

Various modifications in the arrangement and details of the specific embodiment described and shown herein will be apparent to those skilled in the art and are contemplated as within the scope of the present invention as defined in the claims appended hereto.

I claim:

1. In a warm air furnace provided with an outer casing, a heat transfer unit comprising a sheet metal combustion shell having a vertically extending cylindrical body with a bottom wall and a generally semi-spheroidal top wall welded thereto, a sheet metal radiator having a generally dome-shaped outer member and a frusto-conical inner member secured together to define a horizontally arranged annular passage therebetween, a wipe sheet within said casing for absorbing radiant heat from said combustion shell, said wipe sheet being laterally and inwardly spaced from said casing and surrounding said combustion shell and radiator, said outer member being provided with a substantially central opening in its upper end wall and a laterally extending duct in its side wall, said inner mem ber having a generally central upper opening registering with the central opening in the outer member and a second opening in its conical wall portion which is approximately diametrically opposite the laterally extending duct in the outer member, the upper edges of said members defining the central openings being provided with projecting flanges welded together to form an outlet opening over the central portion of the top wall of the combustionshell, the bottom edge of said inner frusto-conical inner member being formed into a flange extending parallel to the lower side Wall portion of the outer member and welded thereto so as to define a flow dividing member projecting downwardly from said annular radiator passage intermediate said wipe sheet and said combustion chamber, the top wall of the combustion shell being positioned generally beneath said radiator and partially projecting into the recess defined by said inner member, said top wall being provided with an opening which is coaxial with the second opening in the conical wall portion of the inner radiator member and a duct interconnecting said coaxial openings to provide communication between the combustion shell and the annular radiator passage, the surface of the radiator adjacent said top wall of the combustion shell forming therewith an inner passage for conveying hot air generally upwardly from the space between said combustion shell and said wipe sheet, the outer wall of the radiator being laterally and inwardly spaced from said-wipe sheet and defining therewith an outer hot air conveying passage generallycoaxial with said inner passage, said flow dividing member being disposed intermediate the inlets of said passages, the smallest cross sectional area of said inner passage being substantially larger than the smallest cross sectional area of said outer passage so as to cause a preponderance of hot air to fiow through said inner passage.

2. In a warm air furnace provided with an outer casing, a heat transfer unit comprising a sheet metal combustion shell having a vertically extending cylindrical body with a bottom wall and a generally semi-spheroidal top Wall welded thereto, a sheet metal radiator having a generally dome-shaped outer member and a frusto-conical inner member secured together to define a horizontally arranged annular passage therebetween, said outer member being provided with a substantially central opening in its upper end Wall and a laterally extending duct in its side wall, said inner member having a, generally central upper opening registering with the central opening in the outer member and a second opening in its conical wall portion which is approximately diametrically opposite the laterally ex tending duct in the outer member, the upper edges of said members defining the central openings being provided with projecting flanges welded together to form an outlet opening over the central portion of the top wall of the combustion shell, the bottom edge of said inner frusto-conical inner member being formed into a flange extending parallel to the lower side wall portion of the outer member and welded thereto so as to define a flow dividing member projecting downwardly from said annular radiator passage intermediate said casing and said combustion chamber, the top wall of the combustion shell being positioned generally beneath said radiator and partially projecting into the recess defined by said inner member, said top wall being provided with an opening which is coaxial with the second opening in the conical wall portion of the inner radiator member and a duct interconnecting said coaxial openings to provide communication between the combustion shell and the annular radiator passage, the surface of the radiator adjacent said top wall of the combustion shell forming therewith an inner passage for conveying hot air generally upwardly from the space between said combustion shell and said casing, the outer wall of the radiator being laterally and inwardly spaced from said outer casing and defining therewith an outer hot air conveying passage generally coaxial with said inner passage, said flow dividing member bein disposed intermediate the inlets of said passages, the smallest cross sectional area of said inner passage being subtantially larger than the smallest cross sectional area of said outer passage so as to cause a preponderance of hot air to flow through said inner passage.

EARL W. J OROLEMON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Re. 6,290 Boyd Feb. 16, 1875 1,490,135 Skinner Apr. 15, 1924 2,185,365 Anthes et a1. Jan. 1940 2,288,258 Ward June 30, 1942 2, 52,556 Eichholtz Nov. 2, 1948 

